The structure of the feed is quite simple as its the same for all modules. If you want to create a custom structure for your feed you can do that by placing a file called (Module Name)_item_rss.tpl into your skin.

eg:
/skins/(YOUR SKIN)/jrAudio_item_rss.tpl

to take control of what you want the structure of that RSS feed to look like. By default it will look like this: